"Alinsky was a critic of mainstream liberalism, which he considered passive and ineffective."."This must be why liberals now prefer to be called 'progressives '?"

In Rules for Radicals, Alinsky outlines his strategy in organizing, writing in the prologue,"There's another reason for working inside the system. Dostoevski said that taking a new step is what people fear most. Any revolutionary change must be preceded by a passive, affirmative,non-challenging attitude toward change among the mass of our people.

They must feel so frustrated, so defeated, so lost, so futureless in the prevailing system that they are willing to let go of the past and change the future.

This acceptance is the reformation essential to any revolution. To bring on this reformation requires that the organizer work inside the system, among not only the middle class but the 40 per cent of American families – more than seventy million people – whose income range from $5,000 to $10,000 a year [in 1971].
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They cannot be dismissed by labeling them blue collar or hard hat. They will not continue to be relatively passive and slightly challenging. If we fail to communicate with them, if we don't encourage them to form alliances with us, they will move to the right. Maybe they will anyway, but let's not let it happen by default.
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He is generally considered to be the founder of modern community organizing in America. His ideas were adapted by some American college students and other young organizers in the late 1960s and formed part of their strategies for organizing on campus and beyond
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Alinsky's teachings influenced Barack Obama in his early career as a community organizer on the far South Side of Chicago. Working for Gerald Kellman's Developing Communities Project, Obama learned and taught Alinsky's methods for community organizing. Several prominent national leaders have been influenced by Alinsky's teachings, including Ed Chambers,[5] Tom Gaudette, Michael Gecan, Wade Rathke,, and Patrick Crowley.
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Community organizing
When describing power, Alinsky could be irreverent:

"Rules for Radicals" begins with an unusual tribute: "From all our legends, mythology, and history (and who is to know where mythology leaves off and history begins – or which is which), the first radical known to man who rebelled against the establishment and did it so effectively that he at least won his own kingdom – Lucifer."
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Alinsky advises his followers that the poor have no power and that the real target is the middle class: "Organization for action will now and in the decade ahead center upon America's white middle class. That is where the power is. ... Our rebels have contemptuously rejected the values and the way of life of the middle class. They have stigmatized it as materialistic, decadent, bourgeois, degenerate, imperialistic, war-mongering, brutalized and corrupt. They are right; but we must begin from where we are if we are to build power for change, and the power and the people are in the middle class majority."
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In the 1930s, Alinsky organized the Back of the Yards neighborhood in Chicago (made infamous by Upton Sinclair's novel The Jungle for the horrific working conditions in the Union Stock Yards). He went on to found the Industrial Areas Foundation while organizing the Woodlawn neighborhood, which trained organizers and assisted in the founding of community organizations around the country. In Rules for Radicals (his final work, published in 1971 one year before his death), he addressed the 1960s generation of radicals, outlining his views on organizing for mass power. In the first chapter, opening paragraph of the book Alinsky writes, "What follows is for those who want to change the world from what it is to what they believe it should be. The Prince was written by Machiavelli for the Haves on how to hold power. Rules for Radicals is written for the Have-Nots on how to take it away!
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He is generally considered to be the founder of modern community organizing in America. His ideas were adapted by some American college students and other young organizers in the late 1960s and formed part of their strategies for organizing on campus and beyond.
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Alinsky was a critic of mainstream liberalism, which he considered passive and ineffective. In Rules for Radicals, he argued that the most effective means are whatever will achieve the desired ends, and that an intermediate end for radicals should be democracy because of its relative ease to work within to achieve other ends of social justice.
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In her memoir, Living History, Hillary Clinton wrote that Alinsky offered her a job after she graduated from Wellesley College, but she chose instead to attend Yale Law School.
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